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987db9f7cd
Use the previously-added transmit-phase skbuff private flag to simplify the socket buffer tracing a bit. Which phase the skbuff comes from can now be divined from the skb rather than having to be guessed from the call state. We can also reduce the number of rxrpc_skb_trace values by eliminating the difference between Tx and Rx in the symbols. Signed-off-by: David Howells <dhowells@redhat.com>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* ar-skbuff.c: socket buffer destruction handling
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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#define is_tx_skb(skb) (rxrpc_skb(skb)->rx_flags & RXRPC_SKB_TX_BUFFER)
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#define select_skb_count(skb) (is_tx_skb(skb) ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)
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/*
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* Note the allocation or reception of a socket buffer.
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*/
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void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
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}
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/*
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* Note the re-emergence of a socket buffer from a queue or buffer.
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*/
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void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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if (skb) {
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int n = atomic_read(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
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}
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}
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/*
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* Note the addition of a ref on a socket buffer.
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*/
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void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
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skb_get(skb);
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}
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/*
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* Note the destruction of a socket buffer.
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*/
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void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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if (skb) {
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int n;
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CHECK_SLAB_OKAY(&skb->users);
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n = atomic_dec_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
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kfree_skb(skb);
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}
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}
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/*
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* Clear a queue of socket buffers.
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*/
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void rxrpc_purge_queue(struct sk_buff_head *list)
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{
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const void *here = __builtin_return_address(0);
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struct sk_buff *skb;
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while ((skb = skb_dequeue((list))) != NULL) {
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int n = atomic_dec_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, rxrpc_skb_purged,
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refcount_read(&skb->users), n, here);
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kfree_skb(skb);
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}
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}
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